minutes
kbps
For bitrate mode.
MB
For file size mode.
Output
Output will appear here
Click in the output to select all text
Audio Bitrate Calculator
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This Audio Bitrate Calculator works in two directions: given a bitrate and duration, it estimates the resulting file size; given a target file size and duration, it calculates the bitrate needed to hit that size. It's useful for podcasters and musicians fitting audio within an upload size limit, or estimating how much storage a batch of audio files will need at a given quality setting. Choose your mode, enter duration plus either bitrate or target size, and get an instant result. Everything runs locally in your browser. Scroll down to choose a mode and enter your numbers.
Features
- Calculates file size from bitrate and duration
- Calculates required bitrate from a target file size
- Works for MP3, AAC, and other constant-bitrate formats
- Instant recalculation as you switch modes
Why use this audio bitrate calculator?
- Plan podcast or music file sizes before exporting
- No manual bitrate math required
- Fully private — nothing uploaded
- Free with unlimited use
Frequently asked questions
What bitrate should I use for good MP3 quality?
192-320 kbps is common for near-transparent MP3 quality for music; podcasts/speech are often fine at 96-128 kbps since spoken word needs less bitrate than music.
How do I fit a podcast under a 10MB upload limit?
Switch to "File size → Required bitrate" mode, enter your episode's duration and 10 MB as the target, and use the resulting bitrate (or lower) when exporting.
Does this work for variable bitrate (VBR) MP3s?
This calculates based on a constant average bitrate; VBR files vary bitrate by content complexity, so actual size may differ somewhat from this estimate.
Does this include ID3 tags or album art in the estimate?
No, embedded album art and metadata add a small amount of extra size beyond the raw audio bitrate calculation.
Can I use this for other audio formats like AAC or OGG?
Yes, the bitrate-to-size math is the same regardless of codec, though different codecs achieve different perceived quality at the same bitrate.